Autisme Information Science

28 mars 2017

Anomalies de l'épaisseur corticale dans les troubles du spectre autistique au cours de l'enfance, l'adolescence et l'âge adulte: une étude IRM à grande échelle

Aperçu: G.M.

Les études de neuroimagerie dans les troubles du spectre de l'autisme (TSA) ont fourni des preuves incohérentes d'anomalies corticales. Cela s'explique probablement par la faible taille des échantillons utilisés dans la plupart des études et par les différences importantes dans les caractéristiques de l'échantillon, notamment l'âge, ainsi que l'hétérogénéité du trouble.

Les résultats montrent une augmentation de l'épaisseur corticale dans le TSA, principalement latéralisé à gauche, à partir de 6 ans, avec des différences diminuant au cours de l'âge adulte. La gravité des symptômes liés à l'affect social et la communication est corrélée avec ces anomalies corticales.

2017 Feb 18:1-11. doi: 10.1093/cercor/bhx038.

Cortical Thickness Abnormalities in Autism Spectrum Disorders Through Late Childhood, Adolescence, and Adulthood: A Large-Scale MRI Study

Khundrakpam BS¹, Lewis JD¹, Kostopoulos P¹, Carbonell F¹, Evans AC¹.

Author information

1: Montreal Neurological Institute, McGill University, Montreal, QC, CanadaH3H2P1.

Abstract

Neuroimaging studies in autism spectrum disorders (ASDs) have provided inconsistent evidence of cortical abnormality. This is probably due to the small sample sizes used in most studies, and important differences in sample characteristics, particularly age, as well as to the heterogeneity of the disorder. To address these issues, we assessed abnormalities in ASD within the Autism Brain Imaging Data Exchange data set, which comprises data from approximately 1100 individuals (~6-55 years). A subset of these data that met stringent quality control and inclusion criteria (560 male subjects; 266 ASD; age = 6-35 years) were used to compute age-specific differences in cortical thickness in ASD and the relationship of any such differences to symptom severity of ASD. Our results show widespread increased cortical thickness in ASD, primarily left lateralized, from 6 years onwards, with differences diminishing during adulthood. The severity of symptoms related to social affect and communication correlated with these cortical abnormalities. These results are consistent with the conjecture that developmental patterns of cortical thickness abnormalities reflect delayed cortical maturation and highlight the dynamic nature of morphological abnormalities in ASD.

PMID: 28334080
DOI: 10.1093/cercor/bhx038

Âge de la première identification du trouble du spectre de l'autisme: une analyse de deux enquêtes américaines

Aperçu: G.M.

Des données probantes concernant l'âge auquel le trouble du spectre autistique est identifié sont essentielles pour améliorer le dépistage précoce. L'objectif de la recherche était d'estimer la répartition par âge pour la première identification des TSA dans les enquêtes nationales auprès des parents.

Dans deux enquêtes nationales, la majorité des parents d'enfants avec un diagnostic de TSA ont déclaré avoir eu une identification après 3 ans, lorsque l'admissibilité aux services d'intervention précoce a expiré et beaucoup ont déclaré avoir eu une identification de TSA après l'âge scolaire. L'identification tardive des enfants présentant des symptômes plus légers met en évidence la nécessité d'un dépistage précoce qui est sensible à toutes les formes de TSA, quelle que soit la gravité.

2017 Apr;56(4):313-320. doi: 10.1016/j.jaac.2017.01.012. Epub 2017 Feb 3.

Age at First Identification of Autism Spectrum Disorder: An Analysis of Two US Surveys

Sheldrick RC¹, Maye MP², Carter AS².

Author information

1: Tufts Medical Center, Boston. Electronic address: rsheldrick@tuftsmedicalcenter.org
2: University of Massachusetts, Boston.

Abstract

OBJECTIVE:

Evidence regarding the age at which autism spectrum disorder (ASD) is identified is essential for improving early detection, yet many extant studies have not applied time-to-event analyses, which account for statistical biases that arise from sampling in cross-sectional surveys by adjusting for child age at time of parental report. Our objective was to estimate age distributions for first identification of ASD in national parent surveys using time-to-event analyses.

METHOD:

We conducted time-to-event analyses of responses to identical questions in the 2011 to 2012 National Survey of Children's Health (n = 95,677) and the 2009 to 2010 National Survey of Children with Special Health Care Needs (n = 371,617).

RESULTS:

Parents in both surveys reported that a minority of ASD cases were identified before age 3 years, and that one-third to one-half of cases were identified after 6 years. In both surveys, a majority of parents described their child's ASD severity as mild, and these parents reported the oldest age at identification (mean, 5.6 and 8.6 years). In contrast, parents who described their child's ASD as severe reported earlier age at identification (mean, 3.7 and 4.5 years). Time-to-event analyses yielded older estimates of age at identification than analyses based on raw distributions.

CONCLUSION:

In two national surveys, a majority of parents of children with ASD reported identification after 3 years, when eligibility for early intervention services expires, and many reported identification of ASD after school age. Later identification of children with milder symptoms highlights the need for early screening that is sensitive to all forms of ASD, regardless of severity.

PMID: 28335875
DOI: 10.1016/j.jaac.2017.01.012

Les difficultés sociales et de communication sont-elles un facteur de risque pour le développement de l'anxiété sociale?

Aperçu: G.M.

L'anxiété sociale (AS) est une condition courante associée aux difficultés sociales et de communication (SC) chez les jeunes en développement, ainsi qu'avec les troubles du spectre de l'autisme. L'étude vise à démêler la relation entre les symptômes de SA et les difficultés de SC à l'aide d'un échantillon basé sur une population de 9 491 enfant.

Plus de difficultés SC ont été associés à de plus grands symptômes AS à tous les âges. Des difficultés précoces de SC difficultés prédisaient une petite quantité, mais significative de la variance dans les symptômes AS plus tard. On n'a pas observé la relation inverse entre les difficultés de AS et SC. La relation entre les difficultés de SC et l'AS était plus forte de 7 à 10 ans. Aucune différence de sexe n'a été observée.

2017 Apr;56(4):344-351.e3. doi: 10.1016/j.jaac.2017.01.007. Epub 2017 Feb 1.

Are Social and Communication Difficulties a Risk Factor for the Development of Social Anxiety?

Pickard H¹, Rijsdijk F², Happé F², Mandy W³.

Author information

1: Medical Research Council (MRC) Social, Genetic, and Developmental Psychiatry (SGDP) Centre, King's College London, UK. Electronic address: hannah.pickard@kcl.ac.uk
2: Medical Research Council (MRC) Social, Genetic, and Developmental Psychiatry (SGDP) Centre, King's College London, UK.
3: University College London, UK.

Abstract

OBJECTIVE:

Social anxiety (SA) is a common condition associated with social and communication (SC) difficulties in typically developing young people, as well as those with autism spectrum disorder (ASD). Whether SC difficulties place children at risk for developing SA is unclear. Using a longitudinal design, the present study aimed to disentangle the relationship between SA symptoms and SC difficulties using a population-based sample of 9,491 children from the Avon Longitudinal Study of Parents and Children (ALSPAC).

METHOD:

Parent-reported data on SC difficulties and SA symptoms were collected at ages 7, 10, and 13 years. A cross-lagged panel model was used to investigate the longitudinal stability and directional relationship between latent SC difficulties and SA constructs over time.

RESULTS:

More SC difficulties were associated with greater SA symptoms at all ages. Earlier SC difficulties predicted a small but significant amount of variance in later SA symptoms. The reverse relationship from SA to SC difficulties was not observed. The relationship from SC difficulties to SA was strongest from age 7 to 10 years. No sex differences were observed.

CONCLUSION:

The evidence suggests that SC difficulties may be an important risk factor for the development of SA. These findings suggest the potential usefulness of incorporating social skills training alongside effective interventions to prevent or alleviate symptoms of SA in childhood.

PMID: 28335879
DOI: 10.1016/j.jaac.2017.01.007

Acquisition du temps d'apparition de la voix chez les tout-petits à faible et fort un risque de développer un trouble du spectre de l'autisme

Aperçu: G.M.

Bien que le retard de langage soit fréquent dans le trouble du spectre de l'autisme (TSA), la recherche est équivoque sur la question de savoir si le développement de la parole est affecté.

Le temps d'apparition de la parole (VOT), la principale différence acoustique entre b et p, a été mesuré à partir des mots spontanément produits à 18, 24 et 36 mois.

Le développement de la distinction entre b et p a été suivi prospectivement chez 22 enfants avec faible risque de TSA (LRC), 22 à risque élevé de TSA sans TSA (HRA-) et 11 à risque élevé de TSA qui ont reçu un diagnostic de TSA à 36 Mois (HRA +).

Les enfants HRA + étaient significativement moins susceptibles de produire des b et p p acoustiquement distincts à 36 mois,

2017 Mar 24. doi: 10.1002/aur.1775.

Acquisition of voice onset time in toddlers at high and low risk for autism spectrum disorder

Chenausky K¹, Tager-Flusberg H².

Author information

1: Music and Neuroimaging Lab, Neurology Department, Beth Israel Deaconess Medical Center, 330 Brookline Avenue, Boston, Massachusetts.
2: Department of Psychological and Brain Sciences, Center for Autism Research Excellence at Boston University, 100 Cummington Mall, Boston, Massachusetts.

Abstract

Although language delay is common in autism spectrum disorder (ASD), research is equivocal on whether speech development is affected. We used acoustic methods to investigate the existence of sub-perceptual differences in the speech of toddlers who developed ASD. Development of the distinction between b and p was prospectively tracked in 22 toddlers at low risk for ASD (LRC), 22 at high risk for ASD without ASD (HRA-), and 11 at high risk for ASD who were diagnosed with ASD at 36 months (HRA+). Voice onset time (VOT), the main acoustic difference between b and p, was measured from spontaneously produced words at 18, 24, and 36 months. Number of words, number of tokens (instances) of syllable-initial b and p produced, error rates, language scores, and motor ability were also assessed. All groups' mean language scores were within the average range or slightly higher. No between-group differences were found in number of words, b's, p's, or errors produced; or in mean or standard deviation of VOT. Binary logistic regression showed that only diagnostic status, not language score, motor ability, number of words, number of b's and p's, or number of errors significantly predicted whether a toddler produced acoustically distinct b and p populations at 36 months. HRA+ toddlers were significantly less likely to produce acoustically distinct b's and p's at 36 months, which may indicate that the HRA+ group may be using different strategies to produce this distinction. Autism Res 2017. © 2017 International Society for Autism Research, Wiley Periodicals, Inc.

PMID: 28339140
DOI: 10.1002/aur.1775

Ne me touchez pas! Les traits autistes modulent les composantes précoces et tardives de l'ERP au cours de la perception visuelle du contact social

Aperçu: G.M.

Bien que les personnes avec un diagnostic de trouble du spectre de l'autisme (TEA) aient des réactions altérées au contact interpersonnel, les corrélats neuronaux sous-jacents demeurent largement inconnus.

Les auteurs émettent l'hypothèse que les personnes ayant des scores élevés au Quotient Autistique (AQ) auraient une hypervigilance tactile relativement élevée, reflétée par les réponses précoces P1 et plus tardives (LPP) positives, deux composantes des potentiels liés aux événements qui servent de marqueurs électrophysiologiques du biais d'anxiété.

Les résultats montrent que les scores AQ ont été corrélés positivement avec l'aversion sociale au toucher, les participants ayant des scores AQ élevés avaient des réponses P1 plus précoces et des réponses LPP plus fortes lorsqu'elles étaient touchées par un contact humain par rapport aux images témoins et un modèle de régression a révélé que P1 précoce et une plus grande amplitude LPP mesurée au cours de l'observation tactile sociale peut prédire avec précision des niveaux plus élevés de traits autistiques.

2017 Mar 24. doi: 10.1002/aur.1762

Don't touch me! autistic traits modulate early and late ERP components during visual perception of social touch

Peled-Avron L¹, Shamay-Tsoory SG¹.

Author information

1: Department of Psychology, University of Haifa, Haifa, Israel.

Abstract

Although individuals with autism spectrum disorder (ASD) have impaired responses to interpersonal touch, the underlying neural correlates remain largely unknown. Here, we examined the neural correlates that underlie interpersonal touch perception in individuals with either high or low autistic traits. Fifty-three participants were classified as having either high or low autistic traits based on their performance on the autism quotient (AQ) questionnaire. We hypothesized that individuals with high AQ scores would have relatively high touch hypervigilance, reflected as earlier P1 and stronger late positive potential (LPP) responses, two components of event-related potentials that serve as electrophysiological markers of anxiety bias. We recorded each participant's electroencephalography activity during presentation of images depicting human touch, object touch, and non-touch control images. Consistent with our hypothesis, AQ scores were positively correlated with social touch aversion. Moreover, participants with high AQ scores had earlier P1 and stronger LPP responses when presented with human touch compared to the control images. Importantly, a regression model revealed that earlier P1 and larger LPP amplitude measured during social touch observation can accurately predict higher autistic trait levels. Taken together, these findings indicate that individuals with high levels of autistic traits may have a hypervigilant response to observed social touch. Autism Res 2017, 0: 000-000. © 2017 International Society for Autism Research, Wiley Periodicals, Inc.

PMID: 28339141
DOI: 10.1002/aur.1762

La schizophrénie, les troubles du spectre de l'autisme et obsessionnels sont-ils dissociables sur la base des résultats morphologiques de la neuroimagerie? Une méta-analyse basée sur le voxel

Aperçu: G.M.

Le trouble du spectre de la schizophrénie (SCZD), le trouble du spectre de l'autisme (ASD) et le trouble du spectre obsessionnel-compulsif (OCSD) sont considérés comme trois états psychiatriques distincts avec, selon de prétendus,modèles d'altération cérébrale différents. L'étude a cherché à vérifier si cette différenciation nosographique est effectivement soutenue par différents modèles cérébraux de modification de la matière grise (GM) ou de la substance blanche (MA) selon deux possibilités: (a) pour déterminer si les altérations GM sont spécifiques pour SCZD, ASD et OCSD; Et (b) associer les schémas d'altération cérébrale identifiés aux dysfonctionnements cognitifs au moyen d'une analyse du décodage des lésions.

Les résultats montrent que ces spectres psychiatriques ne présentent pas de schémas distinctifs distincts de modifications; mais qu'ils ont plutôt tous tendance à être distribués dans deux clusters d'altération. Le groupe 1, qui est plus spécifique pour le SCZD, comprend le cortex antérieur insulaire, le cortex cingulaire antérieur, le cortex préfrontal ventromedial et les zones frontopolaires, qui font partie du système de contrôle cognitif. Le groupe 2, qui est plus spécifique à l'OCSD, présente des modèles d'altération occipitale, temporale et pariétale avec implantation de zones sensoriomotrices, prémotrices, visuelles et linguales, formant ainsi un réseau plus associé à l'auditoire, auditif, prémoteur, aux fonctions somatiques visuelles.

Le TSA semble être uniformément réparti dans les deux groupes.

2017 Mar 24. doi: 10.1002/aur.1759.

Are schizophrenia, autistic, and obsessive spectrum disorders dissociable on the basis of neuroimaging morphological findings?: A voxel-based meta-analysis

Cauda F^1,², Costa T¹, Nani A^1,^2,^3,⁴, Fava L^1,^2,³, Palermo S⁵, Bianco F⁶, Duca S^1,², Tatu K^1,², Keller R⁶.

Author information

1: GCS-fMRI, Koelliker Hospital and Department of Psychology, University of Turin, Turin, Italy.
2: Focus Lab, Department of Psychology, University of Turin, Turin, Italy.
3: Department of Science, University of Eastern Piedmont, Italy.
4: Michael Trimble Psychiatric Research Group, University of Birmingham and BSMHFT, Birmingham, UK.
5: Department of Neuroscience, University of Turin, Turin, Italy.
6: Adult Autism Center, Local Health Unit DSM ASL TO2, Turin, Italy.

Abstract

Schizophrenia spectrum disorder (SCZD), autism spectrum disorder (ASD), and obsessive-compulsive spectrum disorder (OCSD) are considered as three separate psychiatric conditions with, supposedly, different brain alterations patterns. From a neuroimaging perspective, this meta-analytic study aimed to address whether this nosographical differentiation is actually supported by different brain patterns of gray matter (GM) or white matter (WM) morphological alterations. We explored two possibilities: (a) to find out whether GM alterations are specific for SCZD, ASD, and OCSD; and (b) to associate the identified brain alteration patterns with cognitive dysfunctions by means of an analysis of lesion decoding. Our analysis reveals that these psychiatric spectra do not present clear distinctive patterns of alterations; rather, they all tend to be distributed in two alteration clusters. Cluster 1, which is more specific for SCZD, includes the anterior insular, anterior cingulate cortex, ventromedial prefrontal cortex, and frontopolar areas, which are parts of the cognitive control system. Cluster 2, which is more specific for OCSD, presents occipital, temporal, and parietal alteration patterns with the involvement of sensorimotor, premotor, visual, and lingual areas, thus forming a network that is more associated with the auditory-visual, auditory, premotor visual somatic functions. In turn, ASD appears to be uniformly distributed in the two clusters. The three spectra share a significant set of alterations. Our new approach promises to provide insight into the understanding of psychiatric conditions under the aspect of a common neurobiological substrate, possibly related to neuroinflammation during brain development. Autism Res 2017. © 2017 International Society for Autism Research, Wiley Periodicals, Inc.

PMID: 28339164
DOI: 10.1002/aur.1759

Satisfaction de la relation parentale chez les familles d'enfants avec un trouble du spectre de l'autisme (TSA): Une analyse à plusieurs niveaux

Aperçu: G.M.

Le fait de s'occuper d'un enfant avec un diagnostic de trouble du spectre l'autisme (TSA) a été lié à une série de résultats négatifs pour les parents, mais on en sait moins sur l'impact putatif sur la relation parentale. Les résultats indiquent que les mères et les pères ont déclaré des niveaux similaires de satisfaction de la relation et qu'elle était significativement et négativement associée à la dépression parentale et aux problèmes de comportement de l'enfant avec un diagnostic de TSA. La satisfaction de la relation n'était pas liée aux problèmes de comportement d'un frère, au nombre d'enfants dans le ménage et à la situation socioéconomique de la famille (SEP).

2017 Mar 24. doi: 10.1002/aur.1773.

Parental relationship satisfaction in families of children with autism spectrum disorder (ASD): A multilevel analysis

Langley E¹, Totsika V¹, Hastings RP¹.

Author information

1: Centre for Educational Development, Appraisal and Research (CEDAR), University of Warwick, Coventry, CV4 8UW, United Kingdom.

Abstract

Caring for a child with Autism Spectrum Disorder (ASD) has been linked to a range of negative outcomes for parents but less is known about the putative impact upon the parental couple relationship. The relationship satisfaction of parents of children with ASD was investigated using multilevel modeling. Mothers and fathers (146 couples) reported on their relationship satisfaction, their own well-being, and the behavior problems of the child with ASD and a sibling. Results indicated that mothers and fathers reported similar levels of relationship satisfaction and it was significantly and negatively associated with parental depression and the behavior problems of the child with ASD. Relationship satisfaction was unrelated to the behavior problems of a sibling, the number of children in the household, and family socioeconomic position (SEP). Further longitudinal research that captures a broader range of variables is required to build a theoretical understanding of relationship satisfaction in families of children with ASD. Current evidence suggests that early intervention routes targeting either child behavior problems, parental mental health, or the couple relationship have the potential to benefit inter-connected subsystems within the broader family system. Autism Res 2017. © 2017 International Society for Autism Research, Wiley Periodicals, Inc.

KEYWORDS:

ASD; couples; multilevel modeling; relationship satisfaction

PMID: 28339168
DOI: 10.1002/aur.1773

27 mars 2017

Identification des associations probables entre la carence de folate cérébrale et la pathogenèse métabolique et génétique complexe des troubles du spectre de l'autisme grâce à l'utilisation d'une approche pilote de modélisation des interactions

Aperçu: G.M.

Récemment, le déficit en folate cérébral (CFD) a été suggéré d'être impliqué dans la pathogenèse des troubles du spectre de l'autisme (TSA). Cependant, le rôle exact du métabolisme des folates dans la pathogenèse des TSA, l'identification des mécanismes pathogènes sous-jacents et des voies métaboliques altérées restent inexpliqués. Le but de l'étude était d'identifier les liens entre les TSA et le métabolisme cérébral perturbé en mettant l'accent sur le métabolismae anormal du folate.

La stratégie de modélisation utilisée a identifié des interactions déjà connues soutenues par des analyses fondées sur des preuves, mais aussi de nouvelles interactions plausibles qui pourraient être validées dans des études fonctionnelles et / ou cliniques ultérieures

2017 Mar 24. doi: 10.1002/aur.1780.

Identification of likely associations between cerebral folate deficiency and complex genetic- and metabolic pathogenesis of autism spectrum disorders by utilization of a pilot interaction modeling approach

Krsička D¹, Geryk J¹, Vlčková M¹, Havlovicová M¹, Macek M Jr¹, Pourová R¹.

Author information

1: Department of Biology and Medical Genetics, 2nd Faculty of Medicine, Charles University and University Hospital Motol, V Úvalu 84, 150 06 Prague, Czech Republic.

Abstract

Recently, cerebral folate deficiency (CFD) was suggested to be involved in the pathogenesis of autism spectrum disorders (ASD). However, the exact role of folate metabolism in the pathogenesis of ASD, identification of underlying pathogenic mechanisms and impaired metabolic pathways remain unexplained. The aim of our study was to develop and test a novel, unbiased, bioinformatics approach in order to identify links between ASD and disturbed cerebral metabolism by focusing on abnormal folate metabolism, which could foster patient stratification and novel therapeutic interventions. An unbiased, automatable, computational workflow interaction model was developed using available data from public databases. The interaction network model of ASD-associated genes with known cerebral expression and function (SFARI) and metabolic networks (MetScape), including connections to known metabolic substrates, metabolites and cofactors involving folates, was established. Intersection of bioinformatically created networks resulted in a limited amount of interaction modules pointing to common disturbed metabolic pathways, linking ASD to CFD. Two independent interaction modules (comprising three pathways) covering enzymes encoded by ASD-related genes and folate cofactors utilizing enzymes were generated. Module 1 suggested possible interference of CFD with serine and lysine metabolism, while module 2 identified correlations with purine metabolism and inosine monophosphate production. Since our approach was primarily conceived as a proof of principle, further amendments of the presented initial model are necessary to obtain additional actionable outcomes. Our modelling strategy identified not only previously known interactions supported by evidence-based analyses, but also novel plausible interactions, which could be validated in subsequent functional and/or clinical studies. Autism Res 2017. © 2017 International Society for Autism Research, Wiley Periodicals, Inc.

PMID: 28339176
DOI: 10.1002/aur.1780

La perception de la parole multisensorielle dans le trouble du spectre de l'autisme: du phonème à la perception du mot entier

Aperçu: G.M.

La perception de la parole dans les environnements bruyants est stimulée lorsqu'un auditeur peut voir la bouche du locuteur et intégrer les informations auditives et visuelles de la parole. Les enfants autistes ont une capacité réduite à intégrer l'information sensorielle à travers les modalités, ce qui contribue aux symptômes de base de l'autisme, tels que les déficits dans la communication sociale. L'étude explore les capacités des enfants autistes et les enfants au développement typique (TD) à intégrer les stimuli auditifs et visuels dans divers rapports signal / bruit (SNR).

Au niveau de la reconnaissance des phonèmes, les enfants autistes ont présenté une performance réduite par rapport à leurs pairs TD dans les modalités auditives, visuelles et audiovisuelles. Cependant, contrairement à leur performance au niveau de la reconnaissance des mots entiers, les enfants autistes et TD ont montré des avantages de l'intégration multisensorielle pour la reconnaissance du phonème.

Ainsi, alors que les enfants autistes présentaient des bénéfices multisensoriels typiques lors de la reconnaissance du phonème, ces avantages ne se traduisaient pas par un avantage multisensoriel typique de la reconnaissance du mot entier dans les environnements bruyants.

Nous posons l'hypothèse que les déficiences sensorielles chez les enfants autistes augmentent le seuil de SNR nécessaire pour extraire des informations significatives à partir d'une entrée sensorielle donnée, ce qui entraîne la non-présentation des avantages comportementaux d'informations sensorielles supplémentaires au niveau de la reconnaissance de mots entiers

2017 Mar 24. doi: 10.1002/aur.1776.

Multisensory speech perception in autism spectrum disorder: From phoneme to whole-word perception

Stevenson RA^1,², Baum SH³, Segers M⁴, Ferber S^5,⁶, Barense MD^5,⁶, Wallace MT^7,^8,^9,^10,¹¹.

Author information

1: Department of Psychology, Western University, London, ON, Canada.
2: Brain and Mind Institute, Western University, London, ON, Canada.
3: Department of Psychology, University of Washington, Seattle, WA.
4: York University, Toronto, ON, Canada.
5: Department of Psychology, University of Toronto, Toronto, ON, Canada.
6: Rotman Research Institute, Toronto, ON, Canada.
7: Vanderbilt Brain Institute, Nashville, TN.
8: Vanderbilt Kennedy Center, Nashville, TN, USA.
9: Vanderbilt University, Nashville, TN.
10: Department of Hearing and Speech Sciences, Vanderbilt University Medical Center, Nashville, TN.
11: Department of Psychology, Vanderbilt University, Nashville, TN.

Abstract

Speech perception in noisy environments is boosted when a listener can see the speaker's mouth and integrate the auditory and visual speech information. Autistic children have a diminished capacity to integrate sensory information across modalities, which contributes to core symptoms of autism, such as impairments in social communication. We investigated the abilities of autistic and typically-developing (TD) children to integrate auditory and visual speech stimuli in various signal-to-noise ratios (SNR). Measurements of both whole-word and phoneme recognition were recorded. At the level of whole-word recognition, autistic children exhibited reduced performance in both the auditory and audiovisual modalities. Importantly, autistic children showed reduced behavioral benefit from multisensory integration with whole-word recognition, specifically at low SNRs. At the level of phoneme recognition, autistic children exhibited reduced performance relative to their TD peers in auditory, visual, and audiovisual modalities. However, and in contrast to their performance at the level of whole-word recognition, both autistic and TD children showed benefits from multisensory integration for phoneme recognition. In accordance with the principle of inverse effectiveness, both groups exhibited greater benefit at low SNRs relative to high SNRs. Thus, while autistic children showed typical multisensory benefits during phoneme recognition, these benefits did not translate to typical multisensory benefit of whole-word recognition in noisy environments. We hypothesize that sensory impairments in autistic children raise the SNR threshold needed to extract meaningful information from a given sensory input, resulting in subsequent failure to exhibit behavioral benefits from additional sensory information at the level of whole-word recognition. Autism Res 2017. © 2017 International Society for Autism Research, Wiley Periodicals, Inc.

PMID: 28339177
DOI: 10.1002/aur.1776

Apprentissage de la correspondance identitaire des caractères braille pour les lecteurs braille débutants

Aperçu: G.M.

Nous avons enseigné à trois enfants atteints de déficience visuelle à faire des discriminations tactiles de l'alphabet braille dans un format de concordance de à l'échantillon. Afin de minimiser les erreurs des participants, nous avons initialement disposé des caractères braille dans des ensembles de formation dans lesquels il y avait une différence maximale dans le nombre de points dans les stimulus de comparaison cibles et non cibles.

2017 Mar 23. doi: 10.1002/jaba.382.

Teaching identity matching of braille characters to beginning braille readers

Toussaint KA¹, Scheithauer MC², Tiger JH³, Saunders KJ⁴.

Author information

1: University of North Texas.
2: Marcus Autism Center.
3: University of Wisconsin-Milwaukee.
4: University of Kansas.

Abstract

We taught three children with visual impairments to make tactile discriminations of the braille alphabet within a matching-to-sample format. That is, we presented participants with a braille character as a sample stimulus, and they selected the matching stimulus from a three-comparison array. In order to minimize participant errors, we initially arranged braille characters into training sets in which there was a maximum difference in the number of dots comprising the target and nontarget comparison stimuli. As participants mastered these discriminations, we increased the similarity between target and nontarget comparisons (i.e., an approximation of stimulus fading). All three participants' accuracy systematically increased following the introduction of this identity-matching procedure.

PMID: 28332715
DOI: 10.1002/jaba.382

Atributions parentales pour les comportements positifs chez les enfants avec trouble du spectre de l'autisme

Aperçu: G.M.

Les parents d'enfants avec un diagnostic de TSA croyaient que le comportement positif de leur enfant était dû à des facteurs moins internes à l'enfant, moins stables et moins contrôlables par l'enfant que ceux du groupe témoin. Les croyances sur la stabilité étaient associées à la proximité dans la relation parent-enfant. L'âge et le niveau d'incapacité des enfants ainsi que l'éducation des parents étaient associés aux attributions parentales.

2017 Mar 22. doi: 10.1111/jir.12373.

Parental attributions for positive behaviours in children with autism spectrum disorder

Bussanich P¹, Hartley SL¹, Bolt D².

Author information

1: Human Development and Family Studies and Waisman Center, University of Wisconsin-Madison, Madison, WI, USA.
2: Educational Psychology and Waisman Center, University of Wisconsin-Madison, Madison, WI, USA.

Abstract

BACKGROUND:

The present study examined parental attributions for positive child behaviour in children with Autism Spectrum Disorder (ASD) and their association with parent outcomes.

METHOD:

In total, 175 couples who had a child with ASD (5-12 years) completed measures about the child's positive behaviour, ASD symptoms, functional skills and negative behaviour problems, and their own positive and negative affect and closeness in the parent-child relationship. A comparison group of 170 couples who had a child without a neurodevelopmental disability also completed measures.

RESULTS:

Dyadic multilevel models were conducted. Parents of children with ASD believed that their child's positive behaviour was due to factors less internal to the child, less stable and less controllable by the child than the comparison group. Beliefs about stability were associated with closeness in the parent-child relationship. Child age and level of impairment and parent education were associated with parental attributions.

CONCLUSIONS:

Interventions that alter parental attributions may offer pathways to increase closeness in the parent-child relationship.

PMID: 28332245
DOI: 10.1111/jir.12373